EnlargeYouTubeChatProfilePictures.user.js

// ==UserScript==
// @name         Enlarge YouTube Chat Profile Pictures (HD Version with Caching)
// @namespace    https://github.com/Nick2bad4u/UserStyles
// @version      2.0
// @description  Enlarges YouTube chat profile pictures on mouse over, shows HD version, Caches HD images for faster display using Tampermonkey caching.
// @author       Nick2bad4u
// @match        https://www.youtube.com/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// @updateURL    https://github.com/Nick2bad4u/UserStyles/raw/refs/heads/main/EnlargeYouTubeChatProfilePictures.user.js
// @downloadURL  https://github.com/Nick2bad4u/UserStyles/raw/refs/heads/main/EnlargeYouTubeChatProfilePictures.user.js
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @license      UnLicense
// @tag          youtube
// ==/UserScript==

(function () {
  'use strict';

  let debounceTimeout;
  const CACHE_TTL_MS = 24 * 60 * 60 * 1000; // 24 hours in milliseconds
  const preloadedImages = new Map();

  // Load cache from Tampermonkey storage
  function loadCache() {
    const cache = GM_getValue('profilePicCache', {});
    const now = Date.now();
    // Clear out expired cache entries
    Object.keys(cache).forEach((key) => {
      if (now - cache[key].timestamp > CACHE_TTL_MS) {
        delete cache[key]; // Remove expired entry
      }
    });
    GM_setValue('profilePicCache', cache); // Update cache after removing expired entries
    return cache;
  }

  // Save cache to Tampermonkey storage
  function saveCache(cache) {
    GM_setValue('profilePicCache', cache);
  }

  let cache = loadCache(); // Load the cache once when the script runs

  // Preload HD image
  function preloadHDImage(src) {
    const hdSrc = src.replace(/=s32-c/, '=s800-c'); // Adjust as needed for HD
    if (!preloadedImages.has(hdSrc)) {
      if (cache[hdSrc]) {
        // If in persistent cache, load directly from cache
        preloadedImages.set(hdSrc, cache[hdSrc].url);
      } else {
        // Preload HD image and store in cache
        const img = new Image();
        img.src = hdSrc;
        preloadedImages.set(hdSrc, hdSrc); // Store in memory
        cache[hdSrc] = {
          url: hdSrc,
          timestamp: Date.now(),
        }; // Cache with timestamp
        saveCache(cache); // Save the updated cache
      }
    }
  }

  // Function to enlarge profile pictures, show HD image, add black outline, and shift to the right
  function enlargeProfilePic(event) {
    clearTimeout(debounceTimeout);
    debounceTimeout = setTimeout(() => {
      const img = event.target;
      const originalSrc = img.src;
      const hdSrc = originalSrc.replace(/=s32-c/, '=s800-c'); // Increase the size to 800px
      img.dataset.originalSrc = originalSrc; // Store the original src
      // Swap in the HD version, check preloadedImages cache
      img.src = preloadedImages.get(hdSrc) || hdSrc;
      img.style.transform = 'scale(6) translateX(20px)';
      img.style.transition = 'transform 0.2s ease';
      img.style.border = '1px solid black';
      img.style.zIndex = '9999';
      img.style.position = 'relative';
      // Reset after 3 seconds
      setTimeout(() => {
        resetProfilePic(img);
      }, 3000);
    }, 100);
  }

  // Function to reset profile pictures to original size and source
  function resetProfilePic(img) {
    img.src = img.dataset.originalSrc || img.src; // Restore the original src if it was replaced
    img.style.transform = 'scale(1) translateX(0)';
    img.style.border = 'none';
    img.style.zIndex = 'auto';
    img.style.position = 'static';
  }

  // Add event listeners to profile pictures
  function addEventListeners() {
    const profilePics = document.querySelectorAll(
      '.h-5.w-5.inline.align-middle.rounded-full.flex-none'
    );
    profilePics.forEach((pic) => {
      preloadHDImage(pic.src); // Preload HD image
      pic.addEventListener('mouseover', enlargeProfilePic);
    });
  }

  // Observe changes in the chat to dynamically add event listeners
  const observer = new MutationObserver(() => {
    addEventListeners();
  });
  observer.observe(document.body, {
    childList: true,
    subtree: true,
  });

  // Initial call to add event listeners
  addEventListeners();
})();